From c5749639f2d0a1f6cbe187d05f70c2e7c544d748 Mon Sep 17 00:00:00 2001 From: Zheng Wang Date: Thu, 13 Apr 2023 11:34:22 +0800 Subject: scsi: qedi: Fix use after free bug in qedi_remove() In qedi_probe() we call __qedi_probe() which initializes &qedi->recovery_work with qedi_recovery_handler() and &qedi->board_disable_work with qedi_board_disable_work(). When qedi_schedule_recovery_handler() is called, schedule_delayed_work() will finally start the work. In qedi_remove(), which is called to remove the driver, the following sequence may be observed: Fix this by finishing the work before cleanup in qedi_remove(). CPU0 CPU1 |qedi_recovery_handler qedi_remove | __qedi_remove | iscsi_host_free | scsi_host_put | //free shost | |iscsi_host_for_each_session |//use qedi->shost Cancel recovery_work and board_disable_work in __qedi_remove(). Fixes: 4b1068f5d74b ("scsi: qedi: Add MFW error recovery process") Signed-off-by: Zheng Wang Link: https://lore.kernel.org/r/20230413033422.28003-1-zyytlz.wz@163.com Acked-by: Manish Rangankar Reviewed-by: Mike Christie Signed-off-by: Martin K. Petersen --- drivers/scsi/qedi/qedi_main.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/scsi') diff --git a/drivers/scsi/qedi/qedi_main.c b/drivers/scsi/qedi/qedi_main.c index f2ee49756df8..45d359554182 100644 --- a/drivers/scsi/qedi/qedi_main.c +++ b/drivers/scsi/qedi/qedi_main.c @@ -2450,6 +2450,9 @@ static void __qedi_remove(struct pci_dev *pdev, int mode) qedi_ops->ll2->stop(qedi->cdev); } + cancel_delayed_work_sync(&qedi->recovery_work); + cancel_delayed_work_sync(&qedi->board_disable_work); + qedi_free_iscsi_pf_param(qedi); rval = qedi_ops->common->update_drv_state(qedi->cdev, false); -- cgit v1.2.3